For #10496 - Fully expand bottom sheet when loaded

app/src/main/java/org/mozilla/fenix/HomeActivity.kt

@@ -8,7 +8,6 @@ import android.content.Context
 import android.content.Intent
 import android.os.Bundle
 import android.util.AttributeSet
-import android.view.LayoutInflater
 import android.view.View
 import androidx.annotation.CallSuper
 import androidx.annotation.IdRes
@@ -81,10 +80,8 @@ import org.mozilla.fenix.theme.ThemeManager
 import org.mozilla.fenix.utils.BrowsersCache
 import org.mozilla.fenix.utils.RunWhenReadyQueue
 import mozilla.components.concept.tabstray.TabsTray
-import mozilla.components.browser.tabstray.TabsAdapter
 import mozilla.components.browser.tabstray.BrowserTabsTray
 import org.mozilla.fenix.tabtray.FenixTabsAdapter
-import org.mozilla.fenix.tabtray.TabTrayViewHolder
 
 /**
  * The main activity of the application. The application is primarily a single Activity (this one)

app/src/main/java/org/mozilla/fenix/tabtray/FenixTabsAdapter.kt

@@ -28,4 +28,4 @@ class FenixTabsAdapter(
         super.updateTabs(tabs)
         onTabsUpdated?.invoke()
     }
-}
+}

app/src/main/java/org/mozilla/fenix/tabtray/TabTrayView.kt

@@ -100,13 +100,18 @@ class TabTrayView(
             { it.content.private == isPrivate },
             { })
 
-
-        val selectedBrowserTabIndex = if (isPrivate) {
+        val tabs = if (isPrivate) {
             view.context.components.core.store.state.privateTabs
         } else {
             view.context.components.core.store.state.normalTabs
-        }.indexOfFirst { it.id == view.context.components.core.store.state.selectedTabId }
+        }
 
+        val selectedBrowserTabIndex = tabs
+            .indexOfFirst { it.id == view.context.components.core.store.state.selectedTabId }
+
+        if (tabs.size > EXPAND_AT_SIZE) {
+            behavior.state = BottomSheetBehavior.STATE_EXPANDED
+        }
 
         (view.tabsTray as? BrowserTabsTray)?.also { tray ->
             TabsTouchHelper(tray.tabsAdapter).attachToRecyclerView(tray)
@@ -192,6 +197,7 @@ class TabTrayView(
     companion object {
         private const val DEFAULT_TAB_ID = 0
         private const val PRIVATE_TAB_ID = 1
+        private const val EXPAND_AT_SIZE = 3
         private const val SLIDE_OFFSET = 0
         private const val ELEVATION = 90f
     }